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Welcome to the Bunnings Workshop community Kev (@Conquest247). It's wonderful to have you join us, and many thanks for your question about this amazing project.
Hopefully, @gidden81 will get back to us with some details on their project.
Given the weight of the door, I suspect several heavy-duty hinges were used. You've then got the gas struts that help raise and hold the door in position. The struts we keep in-store are of the lighter variety, so you might need to speak with our helpful team at your local Bunnings Special Orders desk to order some more industrial-sized versions from our supplier, Goliath.
Please let me know if you have any questions.
Mitchell
I made a lot of mistakes when I was doing it. I design it so the do reopen on it self when it is shut that how it stay shut. Both of the struts hold about 300kg each. The door is made out of aluminium and so is the frame that the door is in. The rest of the bbq area is made out of timber. the hinge i used m12 hi tensile bolts
for me it was all try and error. I wish I could be more helpfully
